Alright, my roommate has been having some odd digestive issues lately, and I was wondering if I could get some insight.

Basically, he eats a very clean diet, but he has to go number 2 up to six times a day, often with little warning. Other info: he's a big guy, 6'6", about 215, and is a crazy biker - he bikes about 30 miles (2 hours) every day, plus he's started recently doing some lifting after work. He's a reasonably strong guy, rowed heavyweight crew in college. Also he's an invest banking analyst, so he's got a very stressful work environment, long hours, and he has trouble sleeping at night.

A typical day's eating schedule for him might look like:

4 crowns of broccoli, 3 large carrots + almond butter, 6 hardboiled eggs, 3-4 servings of nuts, two bowls of home-cooked chili (beef, broccoli stocks, cabbage, peppers, onions, tomatoes + olive oil), an apple, a pear + a couple servings of grapes, entire head of lettuce for lunch, 2-3 glasses of 1% milk, half an avocado, and up to a whole cooked chicken (maybe a half on average). 4-5 liters of water. Alcohol on the weekends, not excessively though.

During the weekdays he bikes every morning before work, on weekends he bikes later in the day and eats more beforehand than during the week.

As I was just forced to witness, his stool is not normal - he's literally pooping vegetables, like recognizable chunks of broccoli It's not really diarrhea but it happens that suddenly, and is that insubstantial/airy.

Any ideas? He says that things calm down a bit when he cuts down on biking (as you may have guessed, he is one crazy mofo). I know very little about diet, hopefully this is obvious, as it's kind of gross lol.

It isn't the carbs causing the problem it's the cellulose. It passes through your gut completely undigested so with the volume of broccoli and lettuce your friend's eating it's no surprise he's seeing a lot of it coming out the other end. Swap some of the greens for sweet potatoes and bananas and things will return to normal in no time.

Haha thanks for the responses, we'll see if he takes any of the advice. In terms of reducing the carbs, should he just swap out some veggies in favor of meat? I tried getting him to put some olive oil on his salads just to boost his fat, but he's a weirdo and prefers them au naturel. I think I could get him to eat more beef/pork/chicken etc.

On this subject, sorry for such basic questions, but how many veggies are considered optimal for paleo? Recently I've started eating more salads myself, per day average of a little over a pound (mesclun mix, baby spinach, olives, red onions, little feta, chicken, grape tomatoes, red and banana peppers, plus a ton of olive oil). I feel pretty good, but I hadn't thought about consciously reducing other carb intake.

Probably a component of it, for sure...but i think all the cellulose is another key factor here.

The only reason I don't think it is just adrenal fatigue is because even when I am clearly undertrained I experience the same thing (huge pieces of pepper in my stool, for example) when i go way overboard on the fiber and leafy greens. I used to eat 2 bags of salad a day and 2 peppers raw with broccoli etc etc and all that fiber would pass right through me - pretty much untouched - even when I was wrapping up a backoff week.

If he feels fine eating that way when he's not training like crazy, then the excessive training and life stress combining is only allowing the massive amounts of fiber to be the trigger that sets him off.

Haha thanks for the responses, we'll see if he takes any of the advice. In terms of reducing the carbs, should he just swap out some veggies in favor of meat? I tried getting him to put some olive oil on his salads just to boost his fat, but he's a weirdo and prefers them au naturel. I think I could get him to eat more beef/pork/chicken etc.

On this subject, sorry for such basic questions, but how many veggies are considered optimal for paleo? Recently I've started eating more salads myself, per day average of a little over a pound (mesclun mix, baby spinach, olives, red onions, little feta, chicken, grape tomatoes, red and banana peppers, plus a ton of olive oil). I feel pretty good, but I hadn't thought about consciously reducing other carb intake.

If he's covering 30 miles a day on his bike he shouldn't even think about cutting carbs. With that kind of milage plus whatever strength training he's doing he's going to need ~8g/kg/d of CHO unless he wants his performance to suffer.